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Externally supplied barrier gas for arrangement 3 dual pressurized non-contacting gas seals.
A Gas OUT
B Gas IN
2 Vent (if required)
3 Gas barrier inlet (GBI)
4 Gas barrier outlet (GBO) (normally closed), used only to depressurize barrier
5 Seal chamber
Example seal: EagleBurgmann CGSH-KD dual pusher mechanical seal.
Key
1 Barrier gas panel
3 Gas barrier inlet (GBI)
4 Gas barrier outlet (GBO) (normally closed), used only to depressurize barrier
6 From barrier gas supply
FIL Coalescing filter
FIT Flow transmitter with local indicator
PCV Pressure control valve
PIT Pressure transmitter with local indicator
3NC-FB, 3NC-BB, 3NC-FF
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